Environmental issues have long faced our planet, but what did it finally take to set aside a day just for Earth?

Travel back in time to 1974 and listen to Muhammad Ali talk about his upcoming "Rumble in the Jungle" bout with George Foreman.

The 504 Sit-in protest was a pivotal moment in the disability rights movement. The sit-in lasted 28 days and forced the signing of the 504 Regulations, which established protections against discrimination and paved the way for more inclusive workplaces.

Richard Nixon's personality and character issues may have led to his involvement in the Watergate scandal.